Handle for rock drills



June 9, 1931. F. MOCK 1,809,141-

HANDLE FOR ROCK DRILLS Filed D90 21, 1927 INVENTORQ 01112 E 0011;

I [:75 ATT NEY Patented June 9, 19 31 a t-m sm r ns' Joan E. Moon, onIYPHIILLLIPSBUBG,

, drummer messy CITY, NE J-nnsnv, A charmsron or new trnrtsnv' Hauntsfrom noon nit-nits Application "filed necemb'er 21, 1927'; sefiaino.-241;5s5.

l'l his invention relates to' 'ro ck drills, but

more particularly to' a handle for fluid actuated rock drills 'of'thehand 'held type.

il he objects of the invention are to term a rugged and compact h'andleland'tofreduce the o'ost of manufacturing' handles of this type O herobjects will be in part obvious and in part pointed out hereinafter.

In the drawings illustrating the invention,

Figure 1 is a sectional elevation of the rearward portion of a rockdrill having the invention applied thereto, and

Figure 2 is a transverse view Figure 1 on the line 22 looking in thedirection indicated by the arrows.

Referring to the drawings, the invention is shown embodied in a rockdrill of the hand held type having a cylinder A in which is disposed areciprocatory hammer piston B.

The rock drill illustrated is substantially like V V the correctposition of therod K with re that described and claimed in United StatesPatent No. 1,096,087, entitled Fluid operated percussive tool granted toLewis G. Bayles May 19', 1914. The piston B accordingly has i arearwardly extending. shank C on which is formed aneck D adjacent thepiston head for controlling the flow of pressure fluid into the rearwardend of the cylinder. rearward end of the cylinder A is disposed adistributing valve E for controlling the ad-j mission of pressure fluidto the front end-of vthe cylinder. I

A closure is provided for the rearward end of the cylinder A by abackhead F seated on the cylinder to which it may be secured in any suitablemanner.

In accordance with the present invention,'

the back head F is provided with a transverse bore G near its rearwardend. The bore G may spect to the back head'F, said rod is protakenthrough rdri-ll.

In they be of uniform diameter throughout its length, and at. oneend o fthe back fluid into the passageway Y. p i p 7, Beneath the aperture avalve chamber ,i nw'snnsuy, secre ion "mo r'nenrtsonninnnn I videdwithan enlarged portion vLat oneend thus formi-n-ga shoulder O at theinnermost end of the portion L to abut the side-of the back head -Fz'Ontheopposi-teend o'fthe rod K-?is disposed a sleeve -P 'hav-in-ganerter-nal diameter substantially equal @to that of thee'nlargedportion 'Lof the rod. -I Iandleugrips Q, and It are-disposed ontheenlarged gportion Lof the rod -and on the sleeve The handle grips areintended to be-g raspedby the operator if or manipulating the rock drilland may consistof rubber (Jr-other flexible mate'r'ia-l -t o protect theoperators hand against theefl'eots of, the vibration Or n-1e rock Thehandle may T s 1 91a inoperative position in any suitable manner.

the gI-JI'GS-Bl'lt Instance however, this is .ac-

enlarged portion L l which bears against .t"he The V .yhandlelgrip Qissimilarlyiheld by a hollow outermost end otfi the ha'ndle fg rip 'IRQnut'Tjscre'w'ed on the end of the rod K. A

w-asl'ier U is intenposed between-the nut T and the; outer endfiof-the-handle grip Q and bears against tli'eisleeve Pto press the inner end'(j f thje sleeve together-with tliatof the handle grip Qwag-ainst thesideaoif the back 'head F. Preferably the sleeve '1 is of the samelength as the handle grip vQ so that the' washer" U may hearthereagainst without distontirrg the said-handle grip.

In one end of therod K is "formed an oil I, chamber V having a threadedopening V ly e le by t-filler plug screwed i into the opening An oi-lcartridge'Y or a well jk'now'n type is disposed 'ber- V to control thewflo w of 'oil thencfroml In the opposite end of the rod K is fornie'da-pa-ss'ageway Y into which pressure fluid for operating the drillmay'beintroduced Such the oil champressure fluid may be conveyed-from asource e f supply through: a hosefnotlshown) "but which may Joeconnected to the threaded extension Z"on the endof thenut The eX-tension Z is hollow r91- admit'tingpressure b which communicates withthe aassaflewa .c g l A v vis y her through a passage 03. A throttlevalve 6 is disposed in the valve chamber 6 to control communicationbetween the passage 0 and an inlet passage f leading from the Valvechamher I) to the rearward end of the cylinder.

The throttle Valve 6 is normally held in closed position by a spring g.

To the end that the throttle valve 6 may be conventiently manipulated bythe operator Without releasing his hold on the handle grips a throttlevalve lever 72, is pivoted in a slot j in the side of the back head andbears against a projecting end is of the throttle valve. The throttlelever-is of angular shape and has an arm 0 which extends generally inthe direction of the handle grip R against which it may be pressed tomaintain the throttle valve 6' in the open position.

By means of the present invention a rugged handle structure may beobtained. The back head F may be relatively short as compared with otherback heads of this type and the objectionable protuberances usuallyformed on back heads of this type are eliminated.

I claim:.

1. A handle for a fluid actuated rock drill, comprising a back headhaving a transverse bore, atubular rod in the bore extending on oppositesides of the back head, said rod having a Chamber for oil and apassageway for pressure fluid, means in the back head for controllingthe admission of pressure fluid from the rod to the back head, tubularhandle grips on the ends ofthe rod, means on the rod interlockinglyengaging the back head for preventing rotationofthe rod with re spect tothe back head, an integral flange on one'end of the rod forming anabutment for one handle grip, and a hollow nut on the opposite end ofthe rod for maintaining the other handle grip on the rod.

2. A handle for a fluid actuated rock drill, comprising a back headhaving a transverse bore, lugs on the back head disposed on. oppositesides of the aperture, a tubular rod in the bore extending on oppositesides of the back head, said rod having an oil chamber in one end and apassageway for pressure fluid in the other end, flat surfaces on the rodto engage the lugs for preventing relative rotation between the backhead and the rod, handle grips on the ends of-the rod and abutting theback head with their inner ends, a. flange on one end of the rod to actas an abutment for the outer end or" one handle -grip, and aunt on theopposite end of the rod abutting the outer end of the other handle grip,said nut having a threaded portion for connection to a pressure fluidsupply line.

3. A handle for a fluid actuated rock drill, comprising a cylinder and aback head having a transverse bore, lugs on the back head disposed onopposite sides of the aperture, a tubular rod in the bore extending onopposite sides of the back head, said rod having an connection to apressure fluid supply line, a

valve chamber in the back head, passages in the back head connecting thevalve chamber to the oil chamber and the passageway, a

throttle valve in the valve chamber controlling co nunicati'on betweenthe passages and the cylinder, and a lever pivoted to the back head adacent one handle grip formanipulatmg the throttle valve.

specification.

JOHN F. Moore S5 in testimony whereof I have signed this

